[Bug target/125238] [17 Regression] ICE on valid code at -O3 on x86_64-linux-gnu: Segmentation fault since r17-397

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125238

--- Comment #5 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by H.J. Lu <h...@gcc.gnu.org>:

https://gcc.gnu.org/g:ab10e6697f941d4c6a70242dcf1db1db84484113

commit r17-428-gab10e6697f941d4c6a70242dcf1db1db84484113
Author: H.J. Lu <hjl.to...@gmail.com>
Date:   Sat May 9 20:58:11 2026 +0800

    x86_cse: Convert vector load to constant integer load

    Convert vector load:

    (insn 14 465 412 3 (set (reg:SI 507 [ j_lsm.26 ])
            (const_int 2 [0x2])) "foo.c":10:12 discrim 2 100 {*movsi_internal}
         (nil))
    ...
    (insn 518 507 434 16 (set (reg:V2SI 493)
            (reg:V2SI 517)) 2066 {*movv2si_internal}
         (nil))

    to constant integer load:

    (insn 566 55 56 6 (set (subreg:DI (reg:V2SI 517) 0)
            (const_int 8589934594 [0x200000002])) -1
         (nil))
    ...
    (insn 518 507 434 16 (set (reg:V2SI 493)
            (reg:V2SI 517)) 2066 {*movv2si_internal}
         (nil))

    Tested on Linux/x86-64.

    gcc/

            PR target/125238
            * config/i386/i386-features.cc (ix86_broadcast_inner): Set kind
            to X86_CSE_CONST_VECTOR if the vector load can be converted to
            constant integer load.

    gcc/testsuite/

            PR target/125238
            * gcc.target/i386/pr125238.c: New test.

    Signed-off-by: H.J. Lu <hjl.to...@gmail.com>